NIG is aiming to boost its SME book of motor trade risks with the launch of a guide for motor traders and the development of new products.
The insurer said it was "keen" to work with brokers and end customers to "design and provide products to suit their particular needs".
NIG commercial sectors manager Paul Miles said the company had recently added breakdown and technology inspection cover to its motor trade risks.
It had also launched a motor traders' guide called Ignition, available through a specialist motor trade magazine, as part of its drive to raise brand awareness within the sector.
NIG said the guide will include risk management advice and promote the need for impartial advice from brokers.
The insurer said it wanted to grow its share of the sale and repair operations market.
"In terms of exposure we are looking for businesses with up to 250 staff and turnover of up to £25m," NIG said.
In March rival insurer Allianz Cornhill said it wanted to increase its share of the small end of the motor trade market, while MMA has added its motor trade product to its online platform as part of its SME push.
NIG estimated that the motor trade market was worth approximately £550m in gross written premiums.
